Interphase chromosome arrangement in Arabidopsis thaliana is similar in differentiated and meristematic tissues and shows a transient mirror symmetry after nuclear division.

Abstract:

:Whole-mount fluorescence in situ hybridization (FISH) was applied to Arabidopsis thaliana seedlings to determine the three-dimensional (3D) interphase chromosome territory (CT) arrangement and heterochromatin location within the positional context of entire tissues or in particular cell types of morphologically well-preserved seedlings. The interphase chromosome arrangement was found to be similar between all inspected meristematic and differentiated root and shoot cells, indicating a lack of a gross reorganization during differentiation. The predominantly random CT arrangement (except for a more frequent association of the homologous chromosomes bearing a nucleolus organizer) and the peripheric location of centromeric heterochromatin were as previously observed for flow-sorted nuclei, but centromeres tend to fuse more often in nonendoreduplicating cells and NORs in differentiated cells. After mitosis, sister nuclei revealed a symmetric arrangement of homologous CTs waning with the progress of the cell cycle or in the course of differentiation. Thus, the interphase chromosome arrangement in A. thaliana nuclei seems to be constrained mainly by morphological features such as nuclear shape, presence or absence of a nucleolus organizer on chromosomes, nucleolar volume, and/or endopolyploidy level.

journal_name

Genetics

journal_title

Genetics

authors

Berr A,Schubert I

doi

10.1534/genetics.107.073270

subject

Has Abstract

pub_date

2007-06-01 00:00:00

pages

853-63

issue

2

eissn

0016-6731

issn

1943-2631

pii

genetics.107.073270

journal_volume

176

pub_type

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